576: A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R, made up of the same material, are all heated to 20°C above room temperature. When left to cool in the room, which of them will reach the room temperature first?
(a) Circular plate
(b) Cube
(c) Sphere
(d) All of them will reach the room temperature at the same time
577: Assertion (A)
The First War of Indian Independence started in 1857
Reason (R)
The soldiers refused to use the greased cartridges
(a) if A and R both are correct and R is the correct explanation of A
(b) if A and R both are correct but R is not the correct explanation of A
(c) if A is incorrect but R is correct
(d) if A is correct but R is incorrect
578: A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel
(a) kills bacteria
(b) kills germs and spores
(c) absorbs moisture
(d) absorbs all gases present inside the bottle
579: A state in India has the following characteristics:
1. Its northern part is arid and semi arid.
2. Its central part produces cotton.
3. Cultivation of cash crops is predominant over food crops.
Which one of the following states has all of the above characteristics ?
(a) Tamil Nadu
(b) Gujarat
(c) Andhra Pradesh
(d) Karnataka
580: which of the following pairs in respect of correct Power generation in India is/are correctly matched ?
(Rounded Figure)
1. Installed electricity generation capacity : 100000 MW
2. Electricity generation : 660 billion kWh
Select the correct answer using the code given below :
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2